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15. Salix Sect. Heterochromae C. K. Schneider in Sargent, Pl. Wilson. 3: 121. 1916.
紫枝柳组 zi zhi liu zu
Branchlets generally purplish red, slender. Leaf blade narrowly oblong, elliptic, ovate, or broadly ovate, papery, abaxially pale, silky when young, glabrescent or glabrous, margin entire, apex acute to acuminate. Flowering coetaneous. Catkins cylindric, pedunculate; peduncle, with 2 or 3 leaflets deciduous in fruit or leaflets absent; bracts yellowish green to brown. Male flower: gland solitary, adaxial; stamens 2, distinct, rarely united at base; filaments downy proximally. Female flower: ovary silky, stipitate; style conspicuous, 2-cleft; stigma 2-lobed.
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Key based on female plants
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| 1 |
Catkin (1-)1.5-6 cm; ovary shortly stipitate; stipe less than 0.6 mm. |
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(2) |
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Catkin 6-10 cm; ovary long stipitate; stipe more than 0.6 mm. |
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(3) |
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| 2 (1) |
Catkin 4-6 cm, shortly pedunculate; ovary ovoid |
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181 Salix alfredii |
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Catkin ca. 1.5 cm, sessile; ovary ovoid-conical |
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178 Salix taishanensis |
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| 3 (1) |
Bracts lanceolate, villous |
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176 Salix heterochroma |
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Bracts not lanceolate, glabrous. |
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(4) |
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| 4 (3) |
Ovary pilose; bracts truncate at apex |
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180 Salix yadongensis |
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Ovary densely pilose; bracts rounded or acute at apex. |
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(5) |
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| 5 (4) |
Ovary ovoid; bracts obovate-oblong, long ciliate, apex acute |
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177 Salix paraheterochroma |
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Ovary ovoid-conical; bracts elliptic, not ciliate, apex rounded |
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179 Salix trichocarpa |
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List of Keys
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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